Tamoxifen is an antiestrogen drug used in the treatment of breast cancer. It blocks the activity of estrogen, helping to stop the growth of some tumors. Tamoxifen, sold under the brand name Nolvadex among others, is a selective estrogen receptor modulator used to prevent breast cancer in women and men. [15] It is also being studied for other types of cancer. [15] It has been used for Albright syndrome. [16] Tamoxifen is typically taken daily by mouth for five years for breast cancer. [16] Serious side effects include a small increased risk of. Learn about the side effects of tamoxifen, from common to rare, for consumers and healthcare professionals. El tamoxifeno (marcas comerciales: Nolvadex, Soltamox) es un medicamento que bloquea los efectos de la hormona estrógeno (llamada modulador selectivo del receptor de estrógeno o MSRE). El tamoxifeno es la primera opción entre los médicos para tratar a las mujeres que aún no han pasado la menopausia. Find patient medical information for Tamoxifen on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Tamoxifen (brand names: Nolvadex, Soltamox) is a medicine that blocks the effects of the hormone estrogen (called a selective estrogen receptor modulator, or SERM). Tamoxifen is a first choice among doctors for treating women who have not yet gone through menopause. The medicine can also be prescribed to women who have gone through menopause and to men. Tamoxifen blocks the actions of estrogen in breast tissue and is used to treat estrogen receptor-positive breast cancer in adults and to lower the risk of breast cancer in women with DCIS or at high risk. Learn about side effects, interactions, and indications. Taking adjuvant tamoxifen for 10 years after primary treatment leads to a greater reduction in breast cancer recurrences and deaths than taking the drug for only 5 years, according to the results of a large international clinical trial. El tamoxifeno se usa para tratar el cáncer de mama que se ha extendido a otras partes del cuerpo en hombres y mujeres. Se usa para tratar el cáncer de mama precoz en mujeres que ya han sido tratadas con cirugía, radiación y/o quimioterapia. El tamoxifeno es un medicamento que se emplea como terapia complementaria para el cáncer de mama. Se utiliza durante un periodo de 5 años tras finalizar la cirugía y quimioterapia y ha demostrado en diferentes estudios que disminuye considerablemente la probabilidad de que se produzca una reincidencia del tumor. 1.